“Sound check was great. It went really well. I was really excited,” she said in an interview airing Thursday. “During changeover and the ad break, the microphones fell onto the piano strings, which is what the guitar noise was – some people thought it was [Justin] Bieber rehearsing but it wasn't him. We’re on great terms," she said. "And it just kind of put the whole thing off, really."

She knew her performance was not going well, she said.

“I heard it straight away,” she revealed. “I knew what it was… I knew where the mic was and I wanted to turn around and lift it up, but I froze.”

After her performance, Adele said she felt horrible.

“I was embarrassed. I woke up the next morning to people in England being like ‘we still love you. Don’t worry.’ And I was like, ‘I didn’t ask you if you still love me, but thanks,’” she said with a laugh.

She was seriously upset though, she explained.

“I cried pretty much all day [Tuesday],” Adele revealed. "The thing is, in fairness, I would've cried if it had gone really well as well. ... I kept spontaneously bursting into tears yesterday but it was all right, I'm fine."

She said she learned how she will handle sound issues should they ever happen again.

“If it wasn’t live TV, I would have busted a joke,” she said. “Next time I have any sound issues, I am going to stop.”

Adele joked that her Grammys performance has taken some of the pressure off of her.

“I feel the more successful I get, the more pressure there is. I don’t think it could go that much worse than the Grammys though, so I feel like I am all right now.”